INDEX 



245 



S umatra, area luider nibbrr in, ;"> 

 Synthetic rubber, 84 



Tackiness of rubber, 77-0 

 Tacky rubber, composition of, 7S 

 Tapping, general principles of, 



58-61 ; Fitting's researches on 



the effects of, 61-3 

 Tapping systems. 03-0 

 Tennea gestroi, 117, 119 

 Traiisvaal, Landolphia Kirkii in, 



2 7 ; rubber plants of, 2 7 

 Trinidad and Tobago, production 



of rubber in, 10 ; yield of rubber 



from CastiUoa elastica in, 223 



Uganda, area under rubber in, 5, 

 24 ; production of rubber in, 10, 

 22, 23 ; Funtumia elantica in, 

 23; Landolphia florida in, 23; 

 Landolphia subturhinata in, 23 ; 

 Landolphia ugandensis in, 23 ; 

 Clitandra orientalis in, 23, 24 ; 

 Landolphia Dawei in, 23, 24 ; 

 rubber plants of, 23 ; culti- 

 vation of rubber plants in, 24 ; 

 rate of gTowth of Hevea hrasili- 

 ensis in, 115; yield of rubber 

 from Hevea brasiliensis in, 133- 

 5 ; rate of growth of Manihot 

 Glaziovii in, 145 ; yield of rub- 

 ber from Manihot Glaziovii in, 

 1 52-4 : rate of growth of Fun- 

 tumia elastica in, 171 ; yield of 

 rubber from Funtumia elastica 

 in, 183 



United Kingdom, imports and ex- 

 ports of rubber, 92 



United States, imports and ox- 

 ports of rubber, 93 



Urceola elastica, 2, 41 



Urceola esculenta, 41 ; composi- 

 tion of rubber from, 41 



Urticaceae, rubber plants of the, 

 34-0 



Vahea gummifera, 2 



Vine rubbers, composition of, 210 ; 

 cost of collection of, 205 



Vines, African rubber, 39, 1 80-2 1 1 ; 

 Asiatic rubber, 41 ; American 

 rubber, 42 ; rubber-yielding, 

 botanical characters of, 187 ; 

 rubber-yielding, growth of , 191 ; 

 collection of rubber from, 193- 

 7 ; rubber-yielding, coagula- 

 tion of latex of, 194-5; yields 

 of rubber from, 197-204; 

 rubber-yielding, improved 

 methods of exploitmg, 206 ; 

 rubber-yielding, cultivation of, 

 209 



Viscosity of rubber solutions, 88 



Vulcanisation of rubber, 3, 83 



Weeding of rubber plantations, 



116 

 White ants in rubber plantations, 



117, 119 

 Willughbeia forma, 41 



Xylinaharia Eeynaudi, 41 



Zanzibar and Pemba, production 



of rubber in, 10 

 Zanzibar, cultivation of rublier 



plants in, 27 



